Magnetized hypermassive neutron-star collapse: a central engine for short gamma-ray bursts.
Magnetized hypermassive neutron-star collapse: a central engine for short gamma-ray bursts.
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DOI：
10.1103/physrevlett.96.031102
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发表时间：
2005-11
影响因子：
8.6
通讯作者：
M. Shibata;Matthew D. Duez;Yuk Tung Liu;S. Shapiro;B. Stephens
中科院分区：
文献类型：
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作者：
M. Shibata;Matthew D. Duez;Yuk Tung Liu;S. Shapiro;B. Stephens
超大质量中子星（HMNS）是中子星双星合并后可能形成的一种瞬态恒星。在最新的完全广义相对论轴对称磁流体力学模拟中，我们发现磁化的HMNS由于磁制动的角动量输运和磁旋转不稳定性而经历“延迟”坍缩到旋转黑洞（BH）。其结果是一个黑洞被一个巨大的、热的环面包围，并有一个准直的磁场。环面以准稳定的吸积速率吸积到黑洞上；环面的寿命约为10ms。环面有温度[公式：参见文本]，导致大量的（[公式：参见文本]）热辐射，可能引发火球。因此，HMNS的坍缩是产生短时间伽玛射线暴和伴随的引力波和中微子爆发的一个有希望的场景。
A hypermassive neutron star (HMNS) is a possible transient formed after the merger of a neutron-star binary. In the latest axisymmetric magnetohydrodynamic simulations in full general relativity, we find that a magnetized HMNS undergoes "delayed" collapse to a rotating black hole (BH) as a result of angular momentum transport via magnetic braking and the magnetorotational instability. The outcome is a BH surrounded by a massive, hot torus with a collimated magnetic field. The torus accretes onto the BH at a quasisteady accretion rate [FORMULA: SEE TEXT]; the lifetime of the torus is approximately 10 ms. The torus has a temperature [FORMULA: SEE TEXT], leading to copious ([FORMULA: SEE TEXT]) thermal radiation that could trigger a fireball. Therefore, the collapse of a HMNS is a promising scenario for generating short-duration gamma-ray bursts and an accompanying burst of gravitational waves and neutrinos.